Security Flaw Found In Microsoft Browser

A serious security flaw discovered in Microsoft Corp.’s Internet Explorer browser could potentially allow the operator of a Web site to secretly run programs stored on someone’s personal computer.

Microsoft officials said Monday they were testing a solution for the problem and expected to have it quickly posted to the company’s site on the World Wide Web.

The problem could result in all sorts of mischief, such as someone preventing another person’s computer from starting up or sending e-mail from another person’s account, said Simson Garfinkel, a computer security expert.

“It is as if you allowed someone to type on your computer and you go out to lunch,” said Garfinkel.

Internet Explorer, Microsoft’s software for accessing the Web, is used by millions of people worldwide. Microsoft estimates it has a 25 percent to 30 percent market share.